Carriage-jack



.M. C. BURR. Carriag5e-Jack.

No. 226,971. Patented April 27.1880.

'OZW

UNITED STATES PATENT OFFICE,

MELBORNE C. BURR, OF MINNEAPOLIS, MINNESOTA.

CARRIAGE-JACK.

SPECIFICATION formng part of Letters Patent No. 226,971, dated April 27,1880. Application filed Jannary 20, 180.

T0 all whom t't may concem Be it known that I, MELBOURNE ULINTON BURR,of Minneapolis, in the county of Bennepin and State of Minnesota, havemade certain new and useful Improvements in Carriage-Jaoks, whichimprovements are fnlly set forth in the following sp ecification andaccompanying drawings, in which Figure 1 is a side elevation With thejack lowered. Fig. 2 is a side elevation With the jack elevated, andFig. 3 is a front elevation of Fig. 1. Fig. 4 is a plan view of Fig. 1.Fig. 5 is a front elevaton, and Fig. 6 is a rear elevation, of a portionof a jack, showing variations in its method of construction.

This invention relates to carriagejacks; and it consists in thearrangement of the ohooks and lifting-lever whereby a toggle or knncklejoint is formed between the two, and in a cnrved slot in the chock,whereby it may be kept in its proper position in relation to the leverwithont the use of conneoting bolts or straps, as set forth.

A is the base or foot, npon either side of which two nprights orstandards, B, are bolted. Between these standards a chook, C, having thensnal notches a for snpporting the axle. is held by bolts b b passingthrongh holes in the standards and slots.c 0 in the chock.

D is a lever, fnlcrnmed at cl by a bolt pass ing throngh the standards,and provided With a lip, 6, which is ronnded to fit beneath the lowerronnded end, 6 of the choc]: 0. The rear side of the choc]: will be soarranged that it Will act as a stop to the lever when the ohock isclown, while the point 9 when the chook is elevated, will be past thefnlcrnm d, (see Fig. 2,) so that the chock is self-lockmg, the pressurethen coming on the long arm of the lever, and the lower end of thecurved slot acting as a stop to its fnrther progress in a backward orclownward direction. The upper slot, (3, Will rnn at an angle to thestandard B, while the lower slot, will be cnrved, as shown, in such aline as to cause the lower point, 0 of the choc]: to remain in one placeon the lip e so that no bolts or -straps are required to hold the leverand chock together, they both retaining their saine relative positionsat all points of the stroke of the lever.

The tops of the notches a Will be convex,as shown, to cause the chock toroll beneath the axle as it is raised, and thns avoid nnnecessaryfriction.

The sizes of the wheels of vehicles vary so much that it is verydifficnlt to adapt one jack to all. HenceIpropose leavingthechocksWitliont the notches a being formed in them, so that the pnrchaser mayhimself cut the notches in. to fit his own vehicle, as shown in Fig. 5.

The cnrved slot 0 is a very important featare of my invention, as itenables me to dispense With all bolts, straps, &c., to connect the leverand chook.

The upper slot, 0, may be replaced by metal straps h, as shown in Figs.5 and 6, if preferret].

Having thns described 1ny invention, what I claim as new, and desire tosecure by Letters Patent, is

The pivoted lever D, having the lip or step 6, in combination With thechock C, having the slots c 0 one of which is cnrved in a line to causethe point 6 otthe chock to retain the same relative position atallpoints of the stroke of the lever, as set forth.

In testimony whereof I have herennto set my hand in the presence of twosnbscribing witnesses.

MELBOURNE OLINTON BURR.

Witnesses:

O. H. WOODWARD, V. FELL.

